Solid diazoazocompounds



Patented Feb. 23, 1932 UNITED STATES PATENT OFF-ICE SGHNITZSPAHN, F OFFENBACH-ON-THE-MAIN, GERMANY, ASSIGNOR TO GEN- Eli-AL ANILINE WORKS, INC., OF NEW YORK,

N. in, A .conronnrIon or DE A ARE SOLID nmzoszocomroumas "an: Drawing; Application filed September -29, 1927, Serial 1T0. 222,942

My invention relates to new solid diazoazosalts of the general formula:

whereinR and R each stand for. an arylresi- 1 due Whichdoes not contain either a sulfonic or a. carboxylic group, n stands for the numwber 1 or 2 and X an inorganic anion, such as aminophenolether,

halogen, or the residue ofsulfate or bisulfate and others. i The diazoazocompounds may be obtained by diazotizing intheusual manner aminoazobodies, derived from diazocompounds not containing a sulfonic' or car- .boxylic group and aminoderivativesof monoor polyvalent aryloxalkylethers, such as orthoaminocreselether, aminohydroquinone-ethers, 1.2+aminonaptholethers and derivatives (capable of forming paraw aunnoazobodies, and separating the. morgame diazosalts in solidform from the mineral acid diazosolutions thus obtained either by evaporating themat low temperaturesor by precipitating the salts.

. form and that the stability acts is sufiicient for the printing purposes,

It was hitherto unknownlthatthe monodiazoazocompounds of the aforesaid chemical constitution can be isolated in a solid of the solid prodand only thecorresponding diazosolutions freshly prepared from the bases were used hitherto for instancefor the process of U.. S. A. Patent No. 1,498,417.

Therefore the present solid diazoazocompounds are new products, they are orange to reddish brown colored powders, soluble in Water With a yellowish to reddish brown color.

The stability and the commercial value of p, b the new solid diazoazocompounds is apparently a consequence ofthe chemical constitution of the aforesaid aminoazocompounds Whichnrc characterized by an alkoxygroup standingin ortho-position to the aminogroup to be diazotized. The new solid diazocompoundsmay be use for dyeing and mixed with partly or totally dehydratedsalts andother suitable diluents They represent most concentrated diazo preparations ready for immediate use, which valuable disazo dyestuffs on fibers. e p 1 In order to further illustrate my invention the following-examples are g1veu,theparts being by welght and all temperatures incentlgrade degrees, but it is understood, that my invention is not limited to the particular products or reacting conditions mentioned therein. I

Ewample 1 1 To a diazoniumchloridesolution, obtained y diazotizing. ,cthe amino azo in. dilute hydrochloric vacid body: ienitrobenzene azo-(yamino-3-methoxy-6-methylbenzene, common salt is added. having probablythe formula:

separates in a crystalline form and is filtered and dried at about -50% It isan orangebrown owder, soluble in water with a brownis color.

Example 2 A diazoniumbromide solution, obtained by diazotizingin dilute hydrobromic acid the amino azo body: 2-chloro-benzeneazo-4'.

amino-37 ;6.1-dimethoxybenzene, is salted out by adding potassium bromide] The diazo- .nium bromide having probably the formula 0011a separates a crystalline form. It is filtered and dried.atabout40.

mi in Germany October 5, 19262 yield particularly The diazoniumchloride Example 3 From a diazoniumchloride solution, obtained by diazotizing in dilute hydrochloric acid the para-amino-azo body: 2-nitro-5- methylbenzene-azo-U-amino-3'-methoxy-.6' methylbenzene, the solid diazoniumchloride is isolated as described above. 'It corresponds probably to the formula:

CH: CHI

QNr-Qmol NO: CH:

In the same manner the corresponding fluoride may be separated." Both compounds are orange-brown powders solublein water V a yellowish-brown color.

' The para-aminoazobody, obtained combining diazotized' ortho-chloroaniline with ably to the formula:

. In an analogous manner the solid-'diazoniumchloride of the para-aminoazobody: 3- nitrobenzene azoAf-amino-3f -methoxy ben l-a-mino-2 eth0xynaphthalene, is diazotized in dilute hydrochloric acid and from the diazosolution thus obtained the solid diazo nium chloride is isolated as described'in the foregoing examples. It corresponds prob- "Zeno may be obtained.

Ewample5 To a diazonium chloride solution of the aminoazobody, obtained by combining diazotized ortho-nitraniline with- 3-aminolmethoxy-l-methylbenzene, weight of sulfuric acid of 78% strength is added. The thereby separated diazonium-f sulfate corresponding probably to the formula:

NPQNM ,VNYO1 loom is filtered at low temperatures, mixed in moist condition with partly dehydrated aluminium sulfate and dried. It is an orangedissolved in a diazoniumchloride solution,

brown Ipowder, soluble in waterwith aiyel lowishrowu color.

Example 6 l 900 parts of .anhydroussodium sulfate are prepared from 302 parts of the para-aminoazobody: 4 nitrobenzene-a'z o 4" aminoanhydrous sodium sulfate.

one fifth of itsand X for an'inorganic anion,

3.6-dimethoxy-benzene. Then the mixture is evaporated to dryness in vacuo at about 50. The diazonium sulfate thus obtained corresponds probably to the formula:

' 0onom-Om-Omsom o on It represents a brownish powder, soluble in water with a brownish color.

The same diazoniumsulfate may be obtained by adding to the aforesaid diazoniumchloride solution 600 'p'arts'of sulfuric acid of 78% strength and an amount'of sodium sulfate suflicient for saturating the solution. The sulfate thus separating may be filtered, mixedina moist. condition with 400 parts of anhydrous sodium sulfate and dried,

Ea aampZe 7 y r The reaction mixture obtained from 257 parts of Q-me'thozybenzhe-azo- F-amino-EY- methoxybenzene, parts of sodium nitrate and 2570 parts of sulfuric acid of'-95% strength ispoured into 10000 parts of icewater,-to which are then'added 1600 parts of The dia-zoniumsulfate thus separating is carefully "dried.

I A 'diazoniu'msulfate solution, prepared nitrobehzene-azo-f amino -3"- ethoxy-6- methylbenzene, and 6000 parts of sulfuric acid of 78% strength is poured into 900-parts of ice water.

with 240 parts of partly dehydrated aluminium sulfate and 480 parts of anhydrous sodium sulfate and dried. It is a brown powder soluble in water with a brownish color. a r

In an analogous manner the diaz'onium sulfate of the para-aminoazobody: 2-chlo'robenzene-azo 4 4: amino-3 -ethoxy-naphthalene is prepared.

1. As 'new articles of manufacture the solid diazoa'zosalts corresponding probably tothe general formula:

R N 'R(O-a1kyl) X, wherein R and R each stand for an arylres idue which doesnot contain eithera sulfonic or carboxylic group, n for the numberl, or 2 which solid diazosalts are orange to reddish brown powders soluble in water with a yellowish to reddish brown color. I

2. As new articles of manufacture the solid filtered oif'and from 300 parts of the .aminoazobodyz l- 75'; parts of sodium nitrate a The diazoniumsulfate thus separating 1s filtered off, mixed in a still moist condition diazoazosalts corresponding probably to the general formula:

solid diazoazo salts corresponding probably to the general formula:

for a benzene nucleus which may contain nitro and/or alkyl groups, X stands for an inorganic anion and Y for an alkyl or alkoxy group, which solid diazoazo salts are orange to reddish-brown powders, soluble in water with a yellowish to reddish-brown color.

5. As a new article of manufacture the solid diazoazo salt corresponding to the formula:

wherein R stands which solid diazoazo salt represents an orange-brown powder, soluble in water with a brownish color.

6. As a new article of manufacture the solid diazoazo salt corresponding to the formula:

on, on: QN QNa-OI No, on,

which solid diazoazo salt represents an or ange-brown powder, soluble in water with a yellowish-brown color.

In testimony whereof, I afiix my signature.

KARL SCHNITZSPAHN. 

